641341531 has 4 divisors (see below), whose sum is σ = 641442352. Its totient is φ = 641240712.

The previous prime is 641341489. The next prime is 641341549. The reversal of 641341531 is 135143146.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135143146 = 2 ⋅67571573.

It is a cyclic number.

It is not a de Polignac number, because 641341531 - 2¹¹ = 641339483 is a prime.

It is a super-2 number, since 2×641341531² = 822637918770847922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 641341531.

It is not an unprimeable number, because it can be changed into a prime (641341231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40176 + ... + 53821.

It is an arithmetic number, because the mean of its divisors is an integer number (160360588).

Almost surely, 2^641341531 is an apocalyptic number.

641341531 is a deficient number, since it is larger than the sum of its proper divisors (100821).

641341531 is an equidigital number, since it uses as much as digits as its factorization.

641341531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100820.

The product of its digits is 4320, while the sum is 28.

The square root of 641341531 is about 25324.7217358849. The cubic root of 641341531 is about 862.3755893087.

Adding to 641341531 its reverse (135143146), we get a palindrome (776484677).

The spelling of 641341531 in words is "six hundred forty-one million, three hundred forty-one thousand, five hundred thirty-one".